MIDI to CV
About the MIDI to CV PCB
MIDI to CV is an open source AVR/Arduino PCB design by PancakeLegend, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 30 × 100 mm, with 18 components from 15 distinct parts.
Its main chip is the ATtiny45-20P, from the AVR/Arduino family. Other key parts include the 6N138 and L7805. By type, the board carries 5 connectors, 5 resistors, 3 ICs, 3 capacitors and 2 diodes.
It belongs with the audio designs in this gallery.
From the project
A modular synth project
Main components on the MIDI to CV
MIDI to CV bill of materials (BOM)
18 components, 15 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATtiny45-20P | DIP-8_W7.62mm_LongPads | U1 |
| 1 | 6N138 | DIP-8_W7.62mm_LongPads | U2 |
| 1 | L7805 | L7805 - TO-220-3_Horizontal_TabDown | U3 |
| 1 | DIN-5_180degree | DIN-5 - DS-5-07A - MIDI Jack | J1 |
| 1 | PITCH | Jack_3.5mm | J2 |
| 1 | GATE | Jack_3.5mm | J3 |
| 2 | Conn_01x03_Socket | JST_PH_S3B-PH-K_1x03_P2.00mm_Horizontal | J4, J5 |
| 1 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | 1N4002 | D_A-405_P7.62mm_Horizontal | D2 |
| 1 | 100nF | C_Disc_D5.0mm_W2.5mm_P5.00mm | C1 |
| 1 | 10uF 25v | CP_Radial_D4.0mm_P1.50mm | C2 |
| 1 | 1uF 50v | CP_Radial_D4.0mm_P1.50mm | C3 |
| 2 | 220R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2 |
| 1 | 4.7k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 2 | 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4, R5 |
MIDI to CV design files
The KiCad project lives in the PancakeLegend/HackSynth repository on GitHub; these links point at the commit this page was built from.
MIDI to CV: common questions
What microcontroller does the MIDI to CV use?
The MIDI to CV is built around the ATtiny45-20P, from the AVR/Arduino family.
How big is the MIDI to CV PCB?
The MIDI to CV measures 30 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the MIDI to CV?
18 components, from 15 distinct parts. The full bill of materials is listed on this page.
Where can I download the MIDI to CV design files?
From the PancakeLegend/HackSynth repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the MIDI to CV design in my own project?
Yes, under the terms of its GPL-3.0 license, which PancakeLegend chose for the repository.
Can I test firmware for the MIDI to CV without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
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